sports cars z image
Joshua
I live in Clinton Township Michigan. What car rental company rents sports cars like a Ford Mustang, Chevrolet Camaro, or Nissan Z?
Answer
I can't think of a single company that does. These cars carry a too high of a risk that someone will tear them up. You could try renting directly from a dealership. Some do for an astronomical price, but many will only rent 4 cyl sedans.
I can't think of a single company that does. These cars carry a too high of a risk that someone will tear them up. You could try renting directly from a dealership. Some do for an astronomical price, but many will only rent 4 cyl sedans.
A sports car accelerates from zero to 30 mph in 1.5 seconds. How long does it take for it to accelerate from z?
Yves
A sports car accelerates from zero to 30 mph in 1.5 seconds. How long does it take for it to accelerate from zero to 60 mph, assuming the power of the engine to be independent of velocity and neglecting friction?
A) 2 seconds
B) 3 seconds
C) 6 seconds
D) 12 Seconds
explain.
Answer
With constant power, the force has to be inversely proportional to velocity (F x v = P) . So this is a little counterintuitive if you try to attack from the acceleration point of view...
You should take the approach of energy. See what is the ratio of kinetic energy at speed of 30 KMPH to speed of 60 KMPH . Ki netic energy is proportional to square of speed... , so you would get a certain ratio.
Since the power is constant, the time taken will be proportional to the kinetic energy. So, if the ratio of kinetic energy at 60 KMPH is to kinetic energy at 30 KMPH is N:1, the time taken will also have a ratio of N:1.
I don't want to give you the answer, just give you the principle to use, so you can work it out easily.
Hope it helps you, and you vote for the answer.
With constant power, the force has to be inversely proportional to velocity (F x v = P) . So this is a little counterintuitive if you try to attack from the acceleration point of view...
You should take the approach of energy. See what is the ratio of kinetic energy at speed of 30 KMPH to speed of 60 KMPH . Ki netic energy is proportional to square of speed... , so you would get a certain ratio.
Since the power is constant, the time taken will be proportional to the kinetic energy. So, if the ratio of kinetic energy at 60 KMPH is to kinetic energy at 30 KMPH is N:1, the time taken will also have a ratio of N:1.
I don't want to give you the answer, just give you the principle to use, so you can work it out easily.
Hope it helps you, and you vote for the answer.
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